Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0676ea2fab2f12…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 12:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c14f9717ff7005a7c54fc13836ea8852 SHA-1: 743f52220813b15488f22ca17605cd3c6a1b7045 SHA-256: bd0676ea2fab2f121be36d746288bd42e017bf9917cde8434d4eac3332fe6afc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://k-barrierfree.com/FileData/ckfinder/files/20210909_F96FDB8825C530BB.pdf In PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/33470081053.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/rakofosotumewagofix.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/14625847188.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b97b36af7847b2d984f0b0e78e9f3093/44724316098.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/43381609183.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/30442322769.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/80018119703.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/xufunelu.pdfIn PDF document text
    • http://telektrans.hu/editor_up/63205115750.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/godajodulavu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/11001173532.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905084245.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/fotulabesitagujuponuxak.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630666936.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wajom.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/65577503652.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/ganazejitaguj.pdfIn PDF document text
    • https://hssanesteban.cl/files/tipixav.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/12249489930.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/50385882551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+i+delete+dcim+folderPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 18316 bytes
SHA-256: abd746d0821ee312b38affe1f43ff784b3d0a1f7b4f667ae01f30f9d4f42b910
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 10500 bytes
SHA-256: c50d69b34f37ce039a04b647b3bc70574b1382768191426f1a19c8e29faa834d

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